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Type B2 Thymoma : Microscopic

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Type B2 thymomas show polygonal epithelial cells scattered singly or in small clusters in a lymphocyte-rich background. The epithelial density is higher than that seen in type B1 thymoma or normal thymus.

The epithelial cells have round or oval vesicular nuclei with punctate nucleoli. Anaplastic features may be focally present.

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